The antenna feeding line comprises an interdigital structure for enhancing signal coupling and to allow more flexibility for wideband impedance matching .
The interdigital-coupled feeding line connecting a signal source forms a three-finger interdigital structure. One end of the interdigital-coupled-fed line is of the L-shape.
As the coupling coefficients of interdigital structure
is larger than that of combline structure , the interdigital filter is easer to be fabricated and welded with larger coupling space.
So, "Miniaturised artificial magnetic conductors with wide split ring resonators and interdigital structures
," Electronics Letters, Vol.
There is a family of interdigital structures
. The hairpin type filter,|16~ is another variation on the interdigital filter.
To support combline and interdigital structures
, multiple-coupled line models have been developed for =SuperStar= Professional.